output/pipewire: append output name to PW node name

src/output/plugins/PipeWireOutputPlugin.cxx

@@ -366,9 +366,10 @@ PipeWireOutput::Open(AudioFormat &audio_format)
 				       PW_KEY_MEDIA_CATEGORY, "Playback",
 				       PW_KEY_MEDIA_ROLE, "Music",
 				       PW_KEY_APP_NAME, "Music Player Daemon",
-				       PW_KEY_NODE_NAME, "mpd",
 				       nullptr);
 
+	pw_properties_setf(props, PW_KEY_NODE_NAME, "mpd.%s", name);
+
 	if (remote != nullptr && target_id == PW_ID_ANY)
 		pw_properties_setf(props, PW_KEY_REMOTE_NAME, "%s", remote);